update = 5;
newplane = 8;
width = 30;
height = 21;

exit:		( 12  0 x ) ( 29  0 z ) ( 29  6 a ) ( 29 13 a )
		(  9 20 e ) (  0 13 d ) (  0  6 d ) (  0  0 c ) ;

beacon:		( 12 17 ) ( 23  6 ) ( 23 13 ) ( 25 17 )
		( 12  6 ) ( 12 13 ) (  6  6 ) ;

airport:	( 18 17 d ) ;

line:		[ (  1  1 ) ( 16 16 ) ]
		[ (  1  6 ) ( 28  6 ) ]
		[ ( 12  1 ) ( 12 17 ) ]
		[ ( 10 19 ) ( 28  1 ) ]
		[ ( 13 17 ) ( 17 17 ) ]
		[ (  1 13 ) ( 28 13 ) ]
		[ ( 19 17 ) ( 24 17 ) ]
		[ ( 19 17 ) ( 22 14 ) ]
		[ ( 26 16 ) ( 28 14 ) ] ;
